Polyaluminium phosphate-series chlorine-free sulfur-free liquid alkali-free accelerator and preparation method thereof

A technology of polyaluminum phosphate and accelerator, applied in the field of non-alkali accelerator, which can solve the problems of poor homogeneity, low early strength, large dosage, etc., achieve good stability, improve early strength, and have no change in use effect Effect

Active Publication Date: 2018-07-10
贵州天威建材科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a polyaluminum phosphate series chlorine-free and sulfur-free liquid alkali-free quick-setting agent and its preparation method. The quick-setting agent

Method used

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  • Polyaluminium phosphate-series chlorine-free sulfur-free liquid alkali-free accelerator and preparation method thereof
  • Polyaluminium phosphate-series chlorine-free sulfur-free liquid alkali-free accelerator and preparation method thereof
  • Polyaluminium phosphate-series chlorine-free sulfur-free liquid alkali-free accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0042] Embodiment 1-9 formula screening test

[0043] By comparing the different components of the accelerator, screen the following substances in different combination formulas: Al(OH) 3 、Al 2 o 3 , Mg(0H) 2 , phosphoric acid, hydrofluoric acid, fluorosilicic acid, magnesium fluorosilicate, ethanolamine, diethanolamine, triethanolamine, urea, melamine, draw the test group of 9 different formulas, the formula composition of 9 groups of embodiments is shown in Table 1, all the other water Fill to 100%.

[0044] The formula table of table 1 embodiment 1-9 accelerator

[0045]

[0046] The quick-setting agent prepared by the above-mentioned 9 groups of formulas is based on the weight of cement, and the dosage is 5-7%. The product of group embodiment carries out the test of cement slurry setting time and cement mortar compressive strength, and the result shows that the homogeneity of embodiment 7 and embodiment 8, setting time, 1 day strength and the intensity ratio of 28 da...

Embodiment 10～19

[0047] Embodiment 10~19 formula proportioning screening of the present invention

[0048] Below will further carry out proportioning screening to optimal formula, formula proportioning situation is shown in Table 2, and the rest is made up to 100% with water.

[0049] Table 2 Proportion table of the present invention

[0050]

[0051]

[0052] Prepare quick-setting agent according to the formula (10 groups in total) shown in Examples 10-19, take the weight of cement as the basis, and the dosage is 5-7%, according to the Chinese building materials industry standard JC477-2005 "accelerator for shotcrete" The requirements of above-mentioned 10 groups of embodiment products are carried out the test of cement slurry setting time and cement mortar compressive strength, the result shows the homogeneity of embodiment 11 and embodiment 12, setting time, 1-day strength and 28-day strength The ratio is better than other examples. From the amount of screening in Table 2, it can be ...

Embodiment 20～31

[0054] Since the non-alkali liquid quick-setting agent of the present invention has no strong acid radicals and alkali metal ions, it has no erosion effect, but how to solve the problems of homogeneity, dosage and strength of the non-alkali quick-setting liquid quick-setting agent is also the research point of the present invention One, the present invention increases the aluminum content by adding condensing agent and quick-setting agent, and reacts with polyaluminum monohydrogen phosphate, so that the aluminum content of the alkali-free quick-setting agent of the present invention is much higher than that of conventional alkali-free quick-setting 8.6% of the aluminum content in aluminum sulfate octadecahydrate, a commonly used raw material for the agent, and the non-alkali accelerator of the present invention is not easy to combine with water to flocculate, so the content of aluminum, the main coagulation accelerator in the accelerator, can be significantly increased, thereby ...

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Abstract

The invention discloses a polyaluminium phosphate-series chlorine-free sulfur-free liquid alkali-free accelerator and a preparation method thereof and relates to the technical field of alkali-free accelerators. The alkali-free accelerator comprises, by mass, 50-60% of phosphoric acid, 10-15% of alumina, 5-10% of magnesium fluorosilicate, 2-4% of magnesium hydroxide, 2-4% of diethanolamine, 2-6% ofa condensing agent and the balance of water. The accelerator is mainly used in shotcrete, and the use amount of the accelerator is 5 to 7% of that of a gelling material. The accelerator has good stability and does not produce layering and precipitation crystallization and use effect change after being placed at the room temperature and a low temperature (5 DEG C) for 3 months. The accelerator does not contain alkali metal ions, chloride ions and sulfate ions so that the corrosion of the steel bars in the concrete and the alkali aggregate reaction are reduced and the durability of the shotcrete is improved. Through a compatibility of the condensing agent, the compressive strength ratio measured at 28th days is greater than 100% and satisfies the requirement on the one-grade product in JC477-2005.

Description

technical field [0001] The invention relates to the technical field of non-alkali quick-setting agent, in particular to a polyaluminum phosphate series non-chlorine and sulfur-free liquid non-alkali quick-setting agent and a preparation method thereof. Background technique [0002] Accelerator is an admixture mixed into concrete that can make concrete set and harden rapidly. It is an indispensable additive in shotcrete construction method, which accelerates the hydration and hardening of cement and forms sufficient strength in a short time to ensure special Construction requirements, mainly used for shotcrete in tunnels, mines or reinforcement projects. [0003] At present, the domestic mainstream accelerators are mainly alkaline liquid accelerators and a few construction projects have begun to use non-alkali liquid accelerators. Alkaline liquid quick-setting agent is generally a solution composed of aluminum hydroxide and sodium hydroxide. Its technology is mature and its ...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0046C04B2103/12C04B22/165C04B22/066C04B14/303C04B24/122C04B24/126C04B22/126C04B24/128
Inventor 邓怡玄曾炽王艳书刘远杨彰林陶佳
Owner 贵州天威建材科技有限责任公司
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